Is her trying to pick fight?

I have cousin who always fine with me when only she need my help, ex - fixing computer , elertric problems... i gave her my boss motherboard few moth ago and she says she planned to build one new computer, but in the last i called her about this and she say im crazy and insane, and don't want to make one new computer. please tell me what to do now, i know this sonavabiatch changes its decision from time to time and i got pissed of it, now should i take back the motherboard as iui told me boss and he need it back,... its what i am doing is right or wrong?